A network device receives battery status signals for multiple mobile devices and receives a notification of an incoming call from a calling device to a particular mobile device. The network device determines if a battery status, from the battery status signals, is available for the particular mobile device and provides, to the calling device, a challenge to solicit a categorization of the incoming call as important or not important when a battery status is available for the particular mobile device. The network device receives, from the calling device, a response to the challenge, wherein the response includes the categorization of the incoming call. The network device connects the incoming call from the calling device to the particular mobile device when the categorization of the incoming call is important.